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4. On the board of the function switch there are four types of LED lights that correspond to different audio inputs. 2. It has no signal amplification function, but only switching the signal source. 3. It supports four audio input channels and uses function switches to control the output of signals. Features: 1. The product uses a relay to switch signals, and the sound quality is not wasted. 5. The switching order of the audio signals is clockwise or counterclockwise.